Android context menu: Incorrect pressed state color

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I have a very annoying problem with the android context menu: Randomly the pressed-state-color of a (pressed) entry in a context menu is wrong (darker as it should).
now after hours I can reproduce this behaviour with the following code:
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Button b = new Button( this );
b.setText("TEST BUTTON");
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
v.showConte
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